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Anonymous
syscall of the day: rt_(tg)sig(...) 03/31/26(Tue)10:04:25 No.108492651
File: Tumblr_l_36441076739377.jpg (179 KB, 1170x818)
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179 KB JPG
syscall of the day: rt_(tg)sigqueueinfo Anonymous 03/31/26(Tue)10:04:25 No.108492651
previous: >>108485406

#define __NR_rt_sigqueueinfo    129
#define __NR_rt_tgsigqueueinfo        297

https://man7.org/linux/man-pages/man2/rt_sigqueueinfo.2.html

tl;dr:
primitives for io via signals

https://man7.org/linux/man-pages/man3/sigqueue.3.html
why the fuck would anyone ever use this? from what i can tell (and correct me if i am wrong), you can send - at best - a couple ints of data.... ???
literally why would you ever want this? i guess maybe if it's really high speed, it could be useful for certain operations? but like god.... i just can't fathom who's using this

relevant resources: 
man man

man syscalls

https://man7.org/linux/man-pages/
https://linux.die.net/man/
https://elixir.bootlin.com/linux/
https://elixir.bootlin.com/musl/
https://elixir.bootlin.com/glibc/
>>
Anonymous
03/31/26(Tue)13:38:44 No.108494025
Anonymous 03/31/26(Tue)13:38:44 No.108494025
bampu
>>
Anonymous
03/31/26(Tue)19:36:03 No.108496573
Anonymous 03/31/26(Tue)19:36:03 No.108496573
holy dead thread... how depressing
>>
Anonymous
03/31/26(Tue)22:00:50 No.108497349
Anonymous 03/31/26(Tue)22:00:50 No.108497349
File: Tumblr_l_4318595099809.png (848 KB, 1600x1600)
848 KB
848 KB PNG
no one posted in my thread today
quite demoralizing
ok goodnight...
>>
Anonymous
03/31/26(Tue)22:02:00 No.108497354
Anonymous 03/31/26(Tue)22:02:00 No.108497354
>>108497349
to be fair from a quick glance this is a really useless syscall
>>
Anonymous
03/31/26(Tue)22:04:17 No.108497366
Anonymous 03/31/26(Tue)22:04:17 No.108497366
>>108497354
oh, it absolutely is. usually a couple of people will at least trash talk them for being so useless when it's this bad, though
>>
Anonymous
03/31/26(Tue)22:11:08 No.108497403
Anonymous 03/31/26(Tue)22:11:08 No.108497403
>>108497366
although maybe on account of the RT prefix these are meant to be used for like ultralight IPC in like RTOS situations or something?
what i was immediately reminded of was instructions that work with a really tiny globally atomic memory region amd gpus had for a while for global gpu thread synchronization and communication that AMD never really let anyone properly use and doesn't exist on newer hardware since they have real global thread sync instructions now
iirc it worked with their signalling (doorbells) infrastructure
>>
Anonymous
04/01/26(Wed)00:05:52 No.108497934
Anonymous 04/01/26(Wed)00:05:52 No.108497934
>>108497349
Sorry, I was busy all day today and didn't see the thread earlier.
>>
Anonymous
04/01/26(Wed)00:08:27 No.108497951
Anonymous 04/01/26(Wed)00:08:27 No.108497951
>>108497934
i'll forgive u just this once......
>>
Anonymous
04/01/26(Wed)04:44:18 No.108499459
Anonymous 04/01/26(Wed)04:44:18 No.108499459
>>108492651
how do you call syscalls right inside the kernel
>>
Anonymous
04/01/26(Wed)05:00:50 No.108499519
Anonymous 04/01/26(Wed)05:00:50 No.108499519
>>108497349
love u syscall anon
>>
Anonymous
04/01/26(Wed)05:35:22 No.108499654
Anonymous 04/01/26(Wed)05:35:22 No.108499654
>>108492651
>i guess maybe if it's really high speed, it could be useful for certain operations?
I actually doubt sending signals is faster than other types of IPC, since as you noted, nobody uses them for high speed communication, so they never got optimized for that
>you can send - at best - a couple ints of data.... ??? literally why would you ever want this?
I suspect this was added before we got proper message queues. An int is still more than enough to send an internal opcode
>>
s0ychan
04/01/26(Wed)05:36:13 No.108499657
s0ychan 04/01/26(Wed)05:36:13 No.108499657
sucking syscall anon's cock with my butthole
>>
Anonymous
04/01/26(Wed)05:42:58 No.108499679
Anonymous 04/01/26(Wed)05:42:58 No.108499679
>>108499459
there's a syscall instruction and they should be at fixed memory addresses for a given kernel version
and on windows, since it has a proper stable kernel ABI parts of its kernel interface are exported from its binaries, iirc both ntoskrnl.exe and ntdll.dll export the main subset but random shared libraries export other parts of the NT API, you can tell because NT API functions are formatted slightly differently to Win32 API functions (SubsystemFunctionName vs FunctionName)
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